Start of the Arms Race

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Arms Race

During the Cold War the United States and the Soviet Union became engaged in a nuclear arms race. They both spent billions and billions of dollars trying to build up huge stockpiles of nuclear weapons. Near the end of the Cold War the Soviet Union was spending around 27% of its total gross national product on the military. This was crippling to their economy and helped to bring an end to the Cold War. 

Soviet and United States build up of nuclear weapons

The Nuclear Bomb 

The United States was the first to develop the nuclear weapons through the Manhattan Project during World War II. The US ended the war with Japan by dropping nuclear bombs on the cities of Hiroshima and Nagasaki. 

Nuclear bombs are extremely powerful weapons that can destroy an entire city and kill tens of thousands of people. The only time nuclear weapons have been used in war was at the end of World War II against Japan. The Cold War was predicated on the fact that neither side wanted to engage in a nuclear war that could destroy much of the civilized world. 

Start of the Arms Race 

On August 29, 1949 the Soviet Union successfully tested its first atomic bomb. The world was shocked. They did not think the Soviet Union was this far along in their nuclear development. The Arms Race had begun. 

In 1952 the United States detonated the first hydrogen bomb. This was an even more powerful version of the nuclear bomb. The Soviets followed up by exploding their first hydrogen bomb in 1953. 

Space Race leads to creation of ICBMs

In the 1950s both countries worked on developing Intercontinental Ballistic Missiles or ICBMs. These missiles could be launched from long range, as far away as 3,500 miles. 


As both sides continued to develop new and more powerful weapons, the fear of what would happen if war broke out spread throughout the world. Militaries began to work on defenses such as large radar arrays to tell if a missile had been launched. They also worked on defense missiles that could shoot down

At the same time people built bomb shelters and underground bunkers where they could hide in the case of nuclear attack. Deep underground facilities were built for high ranking government officials where they could reside safely. 

Brinkmanship -the tactic of seeming to approach the verge of war in order to persuade one's opposition to retreat. It was an effective tactic because neither side of a conflict could contemplate mutually assured destruction in a nuclear war

Mutual Assured Destruction or MAD. This meant that both countries could destroy the other country in the case of attack. It wouldn't matter how successful the first strike was, the other side could still retaliate and destroy the country which first attacked. For this reason, neither side ever used nuclear weapons. The cost was too high. 

Soviet and United States Bombs

arms race of the cold war

Other Countries Involved 

During the Cold War, three other nations also developed the nuclear bomb and had their own nuclear weapons. These included Great BritainFrance, and thePeople's Republic of China

End of the Arms Race 

For the most part, the Arms Race came to an end with the collapse of the Soviet Union at the end of the Cold War in 1991. 

Interesting Facts About the Arms Race 

  • The Manhattan Project was top secret, even Vice President Truman didn't learn about it until he became president.

  • The US B-52 bomber could fly 6,000 miles and deliver a nuclear bomb.

  • It is estimated that by 1961 there were enough nuclear bombs built to destroy the world.

  • Today India, Pakistan, North Korea, and Israel also have nuclear capability.


  1. Explain the Difference between the A bomb and the Hydrogen Bomb?

  2. How did the Space Race contribute to the fear of Nuclear War?

  3. Explain MAD, who would win in a Nuclear War?

  4. How many bombs set off at the same time could block out the sun for years?

  5. Do you feel a Nuclear War could happen now?

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